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Re: [Qemu-devel] [PATCH] migration: Increase default max_downtime from 3
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From: |
Alexey Kardashevskiy |
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Subject: |
Re: [Qemu-devel] [PATCH] migration: Increase default max_downtime from 30ms to 300ms |
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Date: |
Sat, 07 Jun 2014 02:48:14 +1000 |
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User-agent: |
Mozilla/5.0 (X11; Linux i686 on x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0 |
On 06/06/2014 10:50 PM, Amit Shah wrote:
> On (Thu) 27 Mar 2014 [14:57:26], Alexey Kardashevskiy wrote:
>> The existing timeout is 30ms which on 100MB/s (1Gbit) gives us
>> 3MB/s rate maximum. If we put some load on the guest, it is easy to
>> get page dirtying rate too big so live migration will never complete.
>> In the case of libvirt that means that the guest will be stopped
>> anyway after a timeout specified in the "virsh migrate" command and
>> this normally generates even bigger delay.
>>
>> This changes max_downtime to 300ms which seems to be more
>> reasonable value.
>>
>> Signed-off-by: Alexey Kardashevskiy <address@hidden>
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> Reviewed-by: Amit Shah <address@hidden>
Cool, thanks!
But what is next? The patch is > 2 months old and it is simple and
everything but it did not make it to any tree so far :)
--
Alexey